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Precipitation behavior and mechanical properties of hot-rolled high strength Ti–Mo-bearing ferritic sheet steel: The great potential of nanometer-sized (Ti, Mo)C carbide

Published online by Cambridge University Press:  11 May 2016

Ke Zhang ,
Zhaodong Li ,
Zhenqiang Wang ,
Xinjun Sun  and
Qilong Yong
Ke Zhang*
Affiliation:
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China and Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Zhaodong Li
Affiliation:
Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Zhenqiang Wang*
Affiliation:
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, China, Harbin Engineering University, Harbin 150001, China
Xinjun Sun
Affiliation:
Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Qilong Yong
Affiliation:
Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
*
a) Address all correspondence to these authors. e-mail: [email protected]
b) e-mail: [email protected]
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Abstract

A new ultrahigh strength hot rolled Ti–Mo-bearing ferritic steel was developed through chemical composition design and rolling processing optimization. To maximize the potential of nanometer-sized (Ti, Mo)C carbide in terms of strengthening ferrite matrix, the optimal chemical composition of 0.1C–0.2Ti–0.4Mo (wt%) was determined through considering the atomic ratio of elements, the solubility temperature of (Ti, Mo)C in austenite, and the excessive growth critical temperature of austenite grain during reheating. The rolling condition in the region through austenite recrystallization region to austenite nonrecrystallization region was adopted to realize a homogenous and fine ferrite grain structure. Results showed that the simulated coiling at 600 °C was found to provide an attractive combination of ferrite grain refinement hardening (360 MPa) and precipitation hardening (324 MPa). An optimal combination of strength and ductility was achieved after coiling at 600 °C (yield strength: 912 MPa; ultimate tensile strength: 971 MPa; total elongation: 16.0%). In addition, the nanometer-sized (Ti, Mo)C carbide was characterized by transmission electron microscopy (TEM) and physical–chemical phase analysis, and its role was discussed in details.

Keywords

(Ti, Mo)Ccoiling temperatureprecipitation hardeningnano-sized carbidegrain refinement
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1254 - 1263
Copyright
Copyright © Materials Research Society 2016 

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